NDVI Variations and Its Responses to hydrothermal process in the Naqu River Basin, Qinghai-Tibet Plateau-Alpine Region

¹ Yellow River Engineering Consulting Co., Ltd., Zhengzhou 450003, China
² School of Water Conservancy Engineering ZZU, Zhengzhou University, Zhengzhou 450001, China
³ Science and Technology Innovation Center of Smart Water and Resource Environment, Northeastern University, Shenyang 110819, China

First author’s e-mail address: 18519500795@163.com
Corresponding author’s e-mail address: yuzhl2101@zzu.edu.cn

Abstract

Extensive studies have been conducted over the whole year and various seasons to characterize the temporal and spatial changes in vegetation NDVI. However, there are few studies on the variations of NDVI in different soil hydrothermal processes of the alpine region. So we studied the spatial-temporal variation of vegetation cover and its responses to hydrothermal process in the Qinghai-Tibet Plateau-alpine region. Based on the GIMMS NDVI remote sensing images from 1982 to 2015, the temporal and spatial variations of NDVI in the Naqu river basin at different time scales were studied by using maximum synthesis method, and the linear regression. Results show that the vegetation has an overall degradation trend in the Naqu river basin, with primarily moderate and mild degradation degrees. Completely freezing period, completely melting period and freezing process period are the main vegetation degradation periods.